Since we bind a Contact  entity to a Person, we can choose to give a name to the joining column. The name that we specify here will be the foreign key reference in the target entity, which is the contacts table:

@Table(name = "person")
@Entity
class Person : Identity() {
    @Id
    lateinit var identifier: UUID
    lateinit var name: PersonName
    lateinit var loginId: String

    @Enumerated(EnumType.STRING)
    var preferredLanguage: PreferredLanguage? = null

    @OneToMany(cascade = arrayOf(CascadeType.ALL), fetch = 
     FetchType.LAZY)
    @JoinColumn(name = "PERSON_ID")
    lateinit var contact: List<ContactDetails>
    lateinit var address: Address
}

As the ContactDetails entity always refers to the Person entity with the PERSON_ID as foreign key, we can mark it as non-nullable:

@JoinColumn(name = "PERSON_ID", nullable = false)
lateinit var contact: List<ContactDetails>